Back to the UK for a winter refit

Regarding the platform, how will you cut it? I was thinking something along the lines of the below would maintain (a) the tapering of the existing platform, (b) the complexity of the aft edge and the ladder recess (as per MapisM suggestion) and allow some simple rectangular extensions pieces to be inserted in between the two pieces. Cutting this way would also mean that the edges of the new sections would not be exposed (as they would butt the pod extensions). Would that work?

IMG_0627_zps03d88687.jpg
 
Yep I reckon that's a good idea Pete. I'd been thinking along same opines but hadn't got round to proper thinking and sketching.
Extending the pods seems no big deal to me for a grp expert
 
petem said:
Regarding the platform, how will you cut it? I was thinking something along the lines of the below would maintain (a) the tapering of the existing platform, (b) the complexity of the aft edge and the ladder recess (as per MapisM suggestion) and allow some simple rectangular extensions pieces to be inserted in between the two pieces. Cutting this way would also mean that the edges of the new sections would not be exposed (as they would butt the pod extensions). Would that work?

View attachment 47966
Click to expand...

Hi Pete

It's going to be something like this:

Capture_zpsa66a2c4e.jpg


This preserves the profile of the platform that fits into the boat, which given that the platform is vaguely trapezoidal is probably a Good Thing.
 
jfm said:
Extending the pods seems no big deal to me for a grp expert
Click to expand...

That's an interesting comment. The grp man is suggesting that there is more work in extending the pods than there is in extending the main platform.

It did occur to me that it might be easier to just take a pod from a current Fairline model (eg the T38) and make that fit, rather than fabricate new ones based on the existing pods. I spoke to Fairline about this today, but unfortunately this seems not practical - there's not much inheritance in the design, and the T38 pods are £783 each.
 
jimmy_the_builder said:
Hi Pete

It's going to be something like this:

Capture_zpsa66a2c4e.jpg


This preserves the profile of the platform that fits into the boat, which given that the platform is vaguely trapezoidal is probably a Good Thing.
Click to expand...

That would work too but your design would require seem to require two pieces instead of my rectangles. Surely parallelograms are harder to construct)?
 
jimmy_the_builder said:
That's an interesting comment. The grp man is suggesting that there is more work in extending the pods than there is in extending the main platform.

It did occur to me that it might be easier to just take a pod from a current Fairline model (eg the T38) and make that fit, rather than fabricate new ones based on the existing pods. I spoke to Fairline about this today, but unfortunately this seems not practical - there's not much inheritance in the design, and the T38 pods are £783 each.
Click to expand...

he still has bad memories of the sbd pod on mine which was damaged when I bought evenstar. I think the fact that they are so flimsy doesn't help. Took him ages.
 
petem said:
That would work too but your design would require seem to require two pieces instead of my rectangles. Surely parallelograms are harder to construct)?
Click to expand...

Maybe, but this isn't my call, it's the GRP man's decision. It might have something to do with the structural construction of the platform (it's a sandwich construction, but with fore-aft reinforcing each side of the bathing ladder recess).
 
jimmy_the_builder said:
Maybe, but this isn't my call, it's the GRP man's decision. It might have something to do with the structural construction of the platform (it's a sandwich construction, but with fore-aft reinforcing each side of the bathing ladder recess).
Click to expand...

Fair enough. How long do you reckon hell take? I'm looking in forward to seeing the results.
 
jimmy_the_builder said:
Few weeks I should think. I'm looking forward to it too! :D

PS I liked your 3D printing idea, but cost-prohibitive I suspect.
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J,

3D printing will be worth half the engine rebuilt, forget it.
However, it may be an idea to cut foam in a 5DOF CNC Router and then lay it with whatever to get a decent shape. Finishing will be a bit of hard labour, filling, sanding et al, but doable I recon. CNC has the advantage that you simply model one side, mirror it and send to cutter again, so properly matching sides. I recon cost would be fairly reasonable. Could even use softwood on the router, CPES it and then lay mat and epoxy all over and awgrip it. I assume you are going to paint the platform once all the operations are over, no?

Since I'm doing bugger all atm, I'm quite keen to see some rebuilding action!

cheers

V
 
jimmy_the_builder said:
Hi Rog, yep, they are definitely grp. Very light layup, it's not surprising that they are easy to crunch, they are especially weak where they go round the rubbing strake.
Click to expand...

Thanks for that, I always wondered, never seen one without a crack somewhere. :ambivalence:

Looking at the rebates on the rear quarters, the pods are also handed, what are the chances of making a symmetrical mould so as to only have to make one? It may mean making the leading edge deeper and letting it taper going to the trailing edge, but as the platform will be longer it may just help.:o

RR
 
vas said:
J,

3D printing will be worth half the engine rebuilt, forget it.
However, it may be an idea to cut foam in a 5DOF CNC Router and then lay it with whatever to get a decent shape. Finishing will be a bit of hard labour, filling, sanding et al, but doable I recon. CNC has the advantage that you simply model one side, mirror it and send to cutter again, so properly matching sides. I recon cost would be fairly reasonable. Could even use softwood on the router, CPES it and then lay mat and epoxy all over and awgrip it. I assume you are going to paint the platform once all the operations are over, no?

Since I'm doing bugger all atm, I'm quite keen to see some rebuilding action!

cheers

V
Click to expand...

Vas, I like your idea of using a CNC router but could it not be used to make the mould (instead of my poor 3d printing idea above)? Looks like there are people within 20 miles or so of Jimmys boat that do this see http://www.henleycraft.co.uk/GRP Moulds/GRP Moulds.htm. Probably loads of others.
 
petem said:
Surely parallelograms are harder to construct)?
Click to expand...
Nah, I don't think so.
The very first version of the "arbitrary" cut would have been the simplest and easiest, if it weren't for the 6mm flare.
Considering that, even if I see the merits of your proposal, I think the diagonal solution is the best.
 
jfm said:
I quite like the wrap on guilty but I do struggle with the underlying boxy hull shape
Click to expand...
Yuk.... aside from obviously agreeing with you on the shape, I'm not sure a Riva Venere (just to name one of the possibly more elegant boats) would be improved by tihs sort of wrapping....
Still, definitely each to their own on that! :)
guilty-yacht-jeff-koons.jpg
 
aquapower said:
I would give Clements a call, they do this kind of work, I had a tour round there premises when this was first set up.

http://www.clementsengineering.co.uk/tooling
Click to expand...

Making a CNC cut mould has got to be the way to get the best possible end result. If you want to emulate this then there's some bits that I would have thought were quite difficult to build out from the existing pods such as the recesses for the small teak areas in the corners.

t40esp2.jpg


And with CAD/CNC there's lots of scope for electronic tinkering with the design. But obviously the real benefit has to be that it's more interesting for us lot!

Also, is there any scope of keeping the moulds and and seeing if you could recoup the cost from someone else doing the same job (I admin its a pretty tiny market though so unlikely to be worth the hassle)?

Would a non-marine engineering company be cheaper perhaps?
 
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